Grab



Jan. 29 1924. 1,482,116

A. M. CALLOW GRAB Filed May 12'. 1923 e sheets-sheet n A.' M cALLoW,

By his Attorneys Jan.29, 1924.

A. M. CALLOW GRAB Fied May 12.

6 Sheets-Sheet 2 INVENTOR:

.iimlilll m 1 1 .01d

A. M. 'CALLOW, v @(By his Attor Jan. 149 1924.

A, M. cALLow GRAB 192s e yslwe'csfshe'et a Filed Ma; 12

INVENTOR:

A. M. cALLow,

By 'his Attqrneys ,Y

Jan. 29, 1924. 1,482,116

A. M. CALLOW GRAB vFiled Mlay .12 1925 6 Sheets-Sheet 4 IN VENT OR A. m. cALLow,

y his, AW

Jan. 29, 1924. 1,482,116

A. M. cALLow GRAB Filed May l2. 1923 6 Sheets-Sheet '5 III! f ,ffl a INVENTGR:

A. M. CALLUN,

Af M. CALLOW Jam. 29 1924.l

GRAB

O/I O Patented Jan. 29, i924.

unirse 4.s'irrias' Partnr ortica- ARTHUR MNTGOMERIE CALLG'W, OF LONDON, ENGLAND.

GRAB.

Application filed May l2, 1923. Serial No. 638,495V l To all whom t may concern-f Be it known that l, ARTI-run MONTGOM- nRIE C'ALLow, a subject of the King of Great Britain, residing at G Cowcross Street, IS London, E. C. l, England, have invented' a new and useful Improvement in Grabs, ot which the following is a specification.

rlhis invention relates to single chainf grabs and has for its object to provide a grab which shall be certain'in operation and grabbed, one hall:l of. the bucket being re moved; Figure 2 is a similar View showing the bucket closed with its weight carried by the rope; Figure 3 is a view at right angles `to Figure 2 with the parts in the same position; Figure 4 is a view showing the' head looking in the same direction as in Figure 2, the hook having caught in a suspender ring. Figures 5 and 6 are views looking trom the same direction as Figures 2 and B respectively but showing the bucket open and suspended by the rope.

and Figure 8 is a plan of the body. l Figure 9 is a View illustrating how three suspender rings can be employed to enableV the bucket to be opened at three dierent levels.

A is the head from which thel two halves B, B, of the bucket are suspended yby side rods each of which istormed oi two parts C, C1, connected together by a hinge c. The parts C are hinged to the head ata, a, and the parts C1 are connected tothe corners of the bucket atl o, o. Links D, D, connect the hinges c to they main hinge pins E,

The parts are so arranged thaty when thel bucket is closed as seen most clearlyv in Figfure 3 the parts C and@1 of each side rod are nearly in` line with oney another, but

when the bucket is open. as seen most clearly in Figure 6 the two parts C, C1, are at a considerable angle to one another, with the result that there is very little difference between the vertical over-all dimensions of the grab when open 4and closed.y The head is Vformed ot two' side plates A,A,^ and two end plates F, F1;V Near tothe plate F and supported by the side plates A., A, is a pin Figure 7 is a section on the line a-a of Figure 1,.

fon which is ivoted a frame'consisting ot two bars G, from the middle of each of which rises an arm G1 of which the upper end is formed as a hook g, the two hooks having between them a distance piece g1 which acts as a guide roller for the operating, rope H. 'lo thetwo side plates A, A, are pivoted two downwardly extending links u, J, the lower ends of which are connected byrule joints j to two other double links'K, K, pivoted to the body at la, 76,' one side ot each link K, K, is prolonged below its pivot as seen clearly vin the drawings.

` Fivoted tothe body Z is a rocking frameg L carrying a sheave M. The frame L is adapted to engage the bottom ends of the links K. c The upper ends of the linksJ are formed as bell cranks, that is, they have forwardly extending arms J1 which are linked' by links J2 to the forward ends ofthe bars G; @n the cross pin N which formsthe' pivot ofthe tops of the links J is mounted a guide roller 'a for the rope H. F romthe.

f bars Gr is slung by links O `the top sheave '0.

@n /a cross pivot P carried in the head is mounted abent arm Q to the bottom ot' which the rope is anchored. On the pivot P is mounted a guide roller 7). The arm Q, is prolonged above the pivot P and carries a stud g.' Hinged on a pin r in the head are two side plates R, R1, forming a shroud;

`one R of these plates is prolonged downwards beyond 'its hinge and embraces the stud g. In the upper parts of the two plates, li, lil, are slots S in which can move studs s, s, carried by the` hooks g", g. T is a sheave carried one lined pivot in the body. The rope passes down trom the )ib head between` sheave T and so up to the arm Q,

The operation is as (follow/ste' Assuming `the bucket' to be vresting upon the ground oron the material to be grabbed,

icol

as shown in Figure l, the rocking rameL v will be in its lowest' position, the knees of the toggle links J, K, will be just broken owing to the weight of the hooks g, g, and the parts depending from `them act# ing upon the bell crank arms J1, J1. On

hauling in the rope H the bucket will close and the knees of the toggle links will collapse as shown in Figure 2, the bell crank arms J1 will turn the hooks g, g, into the position shown in Figure 2, while the Vas it rises will a and the grab will be suspended from the j Yune 0n further paying out the ropethe grab will openand discharge and when it :is completely open the toggle links J 'K,

will straighten owingto the weight of the bucket. On the rope being hauled in the rocking frame L, which had dropped when the tension was oit theV rope, will rise and engage the lowei` ends of the links K as shown in Figure 5, so that the toggle links willbeconverted into rigidfstrut-s. Therefore Yas the rope is further hauled in the grab will be lifted in its open position andl the hooks g, g, will'rise above the'rin'gvU. The "shroud R, R1, is then in the position in which it isshown in Figure 5, in which position the hooks will Vbe shrouded so that they cannot again engage the ring, where-V upon `the .open grab may be lowered on to the material. So soon as the load istaken zoll' the vchain or rope the sheave M and its rocking frame L will drop out oi' engagement with the links K, K, and the toggle links J, K,`will lbe free vto break, and'will atY once be broken by the weight of the bars G, G andthe parts depending therefrom actingupon them.

.Should it be grabat different levels two or three suspensionrings may be provided as shown in Figure 9. The ,top ring U carried Yby chains u and additional rings V, V1, are suspended `from the ring U by chains o and by links WV each formed in two parts connected bya rule joint fw. rllhe normal position ot theV three rings is shown Ain Figure 9.` 'lhould itbo desired to discharge from the top ringl the head oi the grab raise the ring' V1 up to the ring V and then `the two rings togetherv upto the ring U. Y y Y v What Iclaim isz- Y ,1; In a grab operated'bfy'a single chain, the combination' of a head, a hook mounted therein and adapted Vto engage a suspender ring, a body` a bucket 'consisting oit two halves'hinged'to the body, side rods connestingV the Ybucket halves to Vthe head, a frame capable of turning about a horizontal axis in the body, a sheave journalled in this frameand toggle links pivoted tothe Vhead and' to the body and adapted to be engagedby the said frame.

2. In a grab operatedby a single chain` the combination ol a head, a hook mounted therein and adapted to enga-ge a suspender desired to discharge theV ring, a body, a bucket consisting of two haltes pivoted to the body, two part side rods connecting the bucket halves to the head, a link connecting the two parts ot each side rod to the b'o'dy, a frame capable of tur-ningl about a horizontal axis in the body, a sheave journalled in said frame, and toggle links. pivoted to the head and to the body and adapted to be engaged by the said trame. f

3. lna grab operated by a single chain, the combination of a head, a frame p-ivoted on a horizontal axis in the heada hook carried by the frame and adapted to engage a suspender ring, a top sheave carried by the frame, a body, a bucket consisting` .of two halves pivoted to the body, side rods connecting the bucket halves to the head, a sheave frame journalled in the body, a sheave thereon, and a suspension rope passing; around the two sheaves.V Y y i 4l. 'In a grab operated by a single chain, the combination ot a head, a frame pivoted on a horizontal axis in the head, ahook car ried by the trame and adapted to engage a lsuspender ring., a top sheave also carried by the frame, a shroud pivoted to the head and adaptedto shroud the hook so that it cannot engage the suspender ring, a body, a bucket consisting of two halves pivoted to thel body, side rods connecting,- the bucket halves to the head, a sheave trame mounted on a horizontal axis in thei'body', a sheave mounted in the sheave trame, a third sheave pivoted to the body, a chain anchoi` pivoted to the head and engaging the shroud andV a suspension rope passing down around the second sheave, around the top sheave, around the. third sheave and connected to the anchor.V i

5. ln a grab operatedy by a single chain, the combination of a head, a frame pivoted on a horizontal axis in the head, a hook carried by the frame 'and adapted to engage a suspender ring', a top sheave carried by the frame, a body,a bucket consisting'of two halves pivoted to the body, side rods/connecting the'bucket halves to the head and each consisting, ot a part hinged to the head and apart hinged to the bucket, these two parts being hinged together, a link connecting the two parts ot' each: side rod to the body, a vsheave frame mounted in the body,a

Jsheave` thereon and a suspensionrope passing' around the two sheaves.

ISG

6. In a grab operated by aV single chain, Y

the combination of a head, a frame pivoted on a horizontal axis in the head, a hook carried by the trame and adapted tovengage a suspender' ring, a top sheave also ,carried by the frame, a yshroud pivoted to the head and adapted to shroud the hook softhat it.` cannot engage the suspender ring, a body, a bucket consisting` of two halves pivoted to the body,.side rods connecting the bucket y to the bucket, these two parts being hinged together, a link connecting the two parts of each side rod to the body, a. sheave frame mounted on a horizontal axis in the body, a sheave mounted in the sheave frame, a third sheave pivoted to the body, a chain anchor pivoted to the head and engaging the shroud and a suspension rope passingv down around 1o the second sheave, around the top sheave,y

around the third Sheaveand connected to the anchor.

In testimonythat I claim the foregoing third day of May, 1923.

ARTHUR MoNTcoMERlE cALLow. 

